Abrasive tool



Dec. 21, 1948. M. 'G. WILLIAMS, JR, EYT AL 2,457,076

ABRAS IVE TOOL Filed Oct. 11, 1946 BY ARTHUR DAHL ATTORNEY MERLYN G WILLIAMS .TR.

Patented Dec. 21, 1948 massive 'roor.

'Merlyn Williams, Jr., Downers Grove,an'd Arthur-mam, chicagoylll.

Application Octoher T11, 1946, S erial N 702,636

' -Z GIaims,

This invention relates to abrasive-tools, and has to do with an abrasive tool of the type wherein p a strip or sheet of abrasive cloth or paper is removably secured to a pad or holder designed to fit in the hand of a"use'r.

It is an object of th'e'present invention to provide a device of this character which will make it possible to remove and replace the'abrasive material with a minimum amount "of effort.

It is also an object of the present invention to provide an abrasive tool of the character described incorporating features of design and construction whichwill assure simple assembly and operation as well as production in volume quantities at a 'relativly low unit cost.

It is a further object to provide a tool of this kind which will accommodate fastening of a wide range of thicknesses of abrasive cloth or paper.

Another object resides in the provision of :an improved tool of the character described comprising an elongated pad having a bottom face and transverse end faces across which the an sive material may be stretched and held taut by means of a clamping member mounted for movement about an upright. central spindle 'gpresenting end surfaces "in cooperation "with the upperlsuriaces of the pad between which ends of the abrasive material may be tightly pressed.

With these and other objects in view-[the invention consistsincertain ovel features of construction and combination of parts, the essential elements of which are set forth in the appended claims, and a preferred form o'f-"embodlment of which is hereinafter shown with reference to the drawing which accompanies and forms a part of this specification.

In the drawing:

Fig. 1 is a top perspective view of the present abrasive tool, illustrating the hand of a user in position for manipulating and operating the same.

Fig. 2 is a side elevational view of the tool.

Fig. 3 is a vertical sectional view taken on line 3-3 of Fi 2.

Fig. 4 is a top plan view thereof showing the clamping member rotated to a position preliminary to being turned into a position to clamp the abrasive material, said latter position being indicated in dotted lines.

Referring now in detail to the drawing, l0 indicates the flat lower surface of a pad or block of rectangular plan, formed of wood or other suitable material. Reference numeral H indicates a fiat upper surface substantially parallel face of the clamping member.

, 2 to thelower surface W. The end faces T2 in transverse relation to the side "faces 1'3 slant Ior curve inwardly and upwardly'to form a smcoth juncture with the upper face H. Slots orl-recesses l'fl formedin the pad to slant'inw'a'rdly and downwardly from the upper surface ,ll of the pad, extending the 'full width thereof and'terminating short of the bottom surface In, forum upwardly Opening pockets across the surface 61' thepad marking thejuncture of the surface .II and the end faces [2. 'The slots Ill accordingly provide pockets in which the opposite ends 15 a .sheetor pile of abrasivepaper or .cioth ltmay be inserted at such time as the portion or paper intermediate said ends is wrapped about the face 'lfll and the end faces'lZ of the pad.

Cooperating with the pad to exert a downward clamping pressure against the portion of the paper 1.6 slightly inward from .the ends f5 thereof disposed in the slots 14 is a clamping member or block of elongated rectangular plan, formed of materialsimil ar to that of'the pad, such as wood or the like. The clampingmember is preferably of such size and shape asito present longitudinal side walls or surfaces l8 at such a distance apart that the fingers of a users hand may-be comfortably and securely gripped lth'e'reabput as shown 'inIEi-gjl. The transverse ends 1'9 arealso preferably located a distance linwa'rd from'jthe' opposite end faces 12 oftheipad when the clamp.- mg member isin operative'position as shown in .2 .(and in .dottedilines in Fig. 4.) $035,120,631 pose ama-Ximum amount of surface of the ahra sive material '16 facing upwardly from the pad. Accordingly the lower face of the clamping member overhangs or overlaps the entrance to the slots l4 only a distance compatible with insuring engagement with the portion of the abrasive material immediately outside the slots.

A spindle in the form of a screw 2!] having a head 2| extending through openings pierced centrally upwardly through the pad and clamping member, provides an axis about which the clamping member may be swung in a horizontal path toward and away from an operative position as shown in Fig. 4. The surface of the clamping member surrounding the threaded portion of the screw 20 projecting upwardly therefrom is preferably counterbored as at 22 to dispose a wing nut 23 having threaded engagement with the screw 20 in depressed relation to the upper sur- The Dad is similarly counterbored at the lower limits of the opening formed therein for the screw 20 so as to position the head 2| of the screw in non-protrude ff i If 9,457,078

ing relation to the lower face of the pad. Accordingly, the screw 20 and wing nut 23 cooperate with the pad and clamping member to grip the abrasive material just outside the entrance to the slots [4, and at the same time permits the clamping member to be easily turned horizontally from a position of engagement with the abrasive material to a position clear thereof so as to clear the slots l4 when it is desired to remove the abrasive material and substitute a new strip or sheet.

As will be observed in Fig. 2, the lower face of the clamping member is preferably concaved in- Wardly so as to avoid contact between the entire area of the facing surfaces of the pad and clamping member extending between the portions thereof which engage the abrasive material. Thus the wing nut 23 may be turned through a substantial range to vary the pressure exerted by the cooperating surfaces of the pad and clamping member against the abrasive material without hindrance of contact between the central portions of the cooperating or facing surfaces of the pad and clamping member.

The sides E3 of the clamping member are preferably grooved or recessed longitudinally as at 25 to provide surfaces with which the fingers of a users hand may be positively retained against slipping in the direction of the article being up erated upon by the abrasive material, during use of the present tool.

The upper face of the clamping member is also preferably bevelled at each end as at 26 to shorten the height of the transverse end surfaces thereof and thereby locate the upper corner of the ends [9 of the clamping member in a plane tangent to the curve formed by the abrasive material at the ends of the pad at a distance substantially above the lower corners of the pad.

While the form of mechanism herein shown and described is admirably adapted to fulfill the object primarily stated, it is to be understood that it'is not intended to confine the invention to the embodiment herein shown and described, as it is susceptible of embodiment in various forms, all coming within the scope of the claims which follow.

, What is claimed is:

1. An abrasive tool comprising a pad of rectangular plan having a fiat bottom face, trans:

verse end faces rising upwardly therefrom, and

a top face substantially parallel to said bottom face, transverse slots intersecting the top face in proximity to said transverse end faces, said slots slanting inwardly and downwardly from said upper face of the pad, a strip of abrasive encir- 4 cling said bottom face and transverse end faces and having its end portions disposed in said slots, and means adapted to exert downward pressure on portions of said abrasive strip immediately outside said slots to hold said strip taut including a clamping member having a bottom face overlapping said portions of the abrasive strip immediately outside said slots, and a central upright spindle connecting said' pad and clamping memher about which said pad may be horizontally turned toward and away from a position in engagement with said abrasive strip.

2. An abrasive tool comprising a pad of rectangular plan having a fiat bottom face, transverse end faces rising upwardly therefrom, and a top face substantially parallel to said bottom face, transverse slots intersecting the top face in proximity to said transverse end faces, a strip of abrasive encircling said bottom face and transverse end faces and having its end portions disposed in said slots, and means adapted to exert downward pressure on portions of said abrasive strip immediately outside said slots to hold said strip taut including a clamping member having a bottom face overlapping said portions of the abrasive strip immediately outside said. slots, said bottom face of the clamping member being concave throughout the area thereof intermediate portions engaged with the abrasive strip, and a central upright spindle connecting-said pad and clamping member about which said pad may be horizontally turned toward and away from a positionin engagement with said abrasive strip.

MERLYN G. WILLIAMS, JR. ARTHUR DAHL. REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number 7 

